dramatically as a matter of fact. why are prices going down and how far? abc's john schriffen is in new york city with some answers. john, good morning. >> reporter: dan, good morning. experts say one of the reasons prices are going down, because after issues earlier this year refineries are back up and running at normal capacity on the east and west coast. with plenty of gas to go around, we'll actually see prices keep falling. drivers can play a game of driver limbo. see how low these prices will go. this weekend, as drivers pull up to the pump and check out the price of gas, they're noticing a welcome trend. >> they're lowering it. it's amazing. >> reporter: just how great has it been? take a look. a month ago, the average was $3.50. last week, it dropped to $3.40. and now, it's down, again, nearly 14 cents from the average a month ago. >> aaa's prediction is that, by christmas, we should have prices between $3.20 and $3.40. >> i'm thrilled. i mean, i have to buy gas no matter what, the fact that it costs a little bit less with christmas coming up. >> reporter: so, what's causing the sudd